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["Peel and cut sweet potatoes into 1-inch chunks. In a large saucepan, cover potatoes with water. Bring to a boil; cook until tender when pierced with the tip of a paring knife, 15 to 20 minutes. Drain.", "Heat butter in a large skillet over medium heat. Add pears; cook, stirring occasionally, until soft and just golden, 12 to 20 minutes. Pour in maple syrup; cook, stirring, until pears are coated and very soft, 3 to 5 minutes.", "Puree the potatoes and pears in food processor, transfer to a bowl, set aside.", "Preheat oven to 375u00b0 F degrees. Butter a souffle baking dish and sprinkle the bottom and the sides with Parmesan cheese. Set aside.", "In a medium saucepan, melt butter over medium-low heat. Add onion, garlic, and thyme; season with salt and pepper. Cook, stirring often, until onion is softened, about 8 minutes. Stir in flour; cook, stirring, 3 minutes.", "Gradually whisk in milk; simmer, whisking constantly, until thickened, about 2 minutes. Remove from heat, and stir in Gruyere cheese and 1 teaspoon salt.", "Whisk in sweet potato and pear puree, orange zest, and then egg yolks, one at a time. Taste and add more salt and pepper if needed.", "In a clean mixing bowl, beat egg whites with a pinch of salt until stiff peaks form. Whisk 1/4 of whites into cheese, sweet potato, and pear mixture. Using a rubber spatula, gently fold in the rest.", "Place souffle baking dish on a rimmed baking sheet. Pour in mixture, smooth out the top. Bake until puffed and golden brown, 35 to 40 minutes.
